All chemical components of oil and gas are _________________________,

All chemical components of oil and gas are _________________________,

Question
TEST 2
All chemical components of oil and gas are _________________________, meaning they are composed exclusively of the elements _____________ and ____________________
In recent years, the Marcellus shale in Pennsylvania and surrounding states has been increasingly exploited for its _______________ as an energy source. Because shale is a much more difficult rock to extract resources from, the technique of _______________________________ has been used. Recent controversy over this technique has emerged, as evidence suggests that it is associated with contamination of water
TEST 2
The black color of soil and the fertility of soil are mostly determined by the quantity of organic material, or ___________________, in the top soil layer.
Breakdown of rocks happens through ______________ weathering, ____________________________ weathering or _________________ processes.
The formation of petroleum initially requires deposition of organic-rich sediments in a ________________________ setting. The formation of coal initially requires deposition of organic-rich sediments in a _______________________ setting.
How many pounds of grain does it take to produce one around of protein from cattle?
What mining practice was outlawed in 1884 in the first environmental lawsuit?